Transmission Position Sensor/Switch: Testing and Inspection

Injection Electronics (Motronic Control System) With Automatic Transmission. Wiring Diagram:

1. With the ignition switch OFF, disconnect the DME control unit harness connector (located in the glove box) see COMPONENT LOCATIONS.
2. Turn the ignition switch to the run (ON) position and place the transmission range selector in park. Make the following voltage measurements at the DME control unit harness connector.

^ Brown/black wire (terminal 42) and ground = Battery voltage If not check fuse fuse 10 at the power distribution box

3. Place the transmission range selector in neutral. Make the following voltage measurements at the DME control unit harness connector.

^ Brown/black wire (terminal 42) and ground = Battery voltage If not check fuse fuse 10 at the power distribution box

4. If OK, disconnect harness connector C1 at the transmission range selector switch and make the following voltage/resistance measurements.

^ Blue/brown wire (terminal 6) of range selector
switch to terminal 42 of the DME control unit = 0 Ohms If not check for an open
^ Blue/yellow wire (terminal 4) of range selector
switch to terminal 42 of the DME control unit = 0 Ohms If not check for an open

^ Terminal 3 of connector C1 and ground = Battery voltage If not check wire from terminal 3 to fuse 10 for an open and repair or replace as necessary.

5. If OK, check for continuity at the transmission range selector switch

^ Between terminals 3 and 6 and terminals 3 and 4 = 0 Ohms If not the transmission range selector switch is defective